Mike,
I would probably mill a slot/flat on the bottom of the piston to take the steel sear part, thus eliminating the shear factor. I certainly would not depend on 2 or 3 6-32 SHCS's to hold it. Possibly even use roll pins perpendicular to the sear to fasten it as I think there would be enough "meat" to inset and drill through if I keep the ID of the piston just enough to keep the spring from rubbing.
Kasinet is a good product, used to have some years back... heat the part dull red and plunge into the powder as I recall and it did case harden the first few thousanth's of steel (my older brother is a flintlock/percussion colector but not a machinest so I used to help him out)
So do you have any feel if a lighter piston/sear assembily would increase the avalable power? My gut feeling is less dead mass to move = more velocity avalable at the breach but I could be all wrong, math is not my strong point.
I asked in another thread about presure developed in a springer, like I said my math skills s***, but thinking a 1" piston area = 0.78535sq/in and if the stroke is say 1.5 it would be 4.7123889803850005 cubic inches so I would give or take at 1 atmosphere = 14.696 x 4.7123889803850005 = 69.247552 PSIG. Again no idea if this is a valid theory or close.
So now another question would be is it pressure or volume that affects the final velocity of a pellet?
Taking the previous example of the volume of the cylinder 4.7 cu in and applying it to the volume of the pellet moving 1.5" with a pellet volume of 0.147 cu in 4.7/.147= 31.9 as the ratio of the volume. Seems like the pellet would be long gone from the muzzle before all that volume of air was discharged.
All speculation but food for thought.
Kristin
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